osmocom-sdr

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904 discussions

rtl_fm scanning
by Ben Moore 24 Feb '13

24 Feb '13

I am having a problem with using multiple frequencies with rtl_fm. Single frequencies work just fine. For example: rtl_fm -f 462.5625M -f 462.5725M -N -s 12k -r 12k -g 48 -l 50 | play -r 12k -e signed-integer -b 16 -t raw -c 1 -V1 - Will get to: Sampling at 1008000 Hz. Output at 12000 Hz. Exact sample rate is: 1008000.009613 Hz Tuner gain set to 48.00 dB. Then freeze. If I set the squelch low enough, it will continuously monitor the first channel. If I have a transmitter on before starting the command, it will monitor that. But when the transmitter turns off, rtl_fm hangs. I looked at the code but couldn't fix it. Maybe it's some reset command that's not being done between frequencies. If I force "data_ready" to unlock, it scans, but there's no data. Although, rtl_tcp works just fine when connecting with SDR# and changing frequencies. This is on a Raspberry Pi btw, latest rtl-sdr source code. Sorry if this has already been discussed somewhere, I could not find it. - Ben

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rtlsdr-based spectrum analyzer on a Beaglebone
by Alexandru Csete 19 Feb '13

19 Feb '13

Greetings, It is my pleasure to share with you a small, fun project I made few weeks ago: an rtlsdr-based spectrum analyzer running on a Beaglebone with an LCD3 touch screen. Video demo: http://www.youtube.com/watch?v=jzmFXreuFR4 Howto guide: http://www.oz9aec.net/index.php/beaglebone/480-rtlizer I also took the opportunity to start collecting bitbake recipes to create sdr oriented linux images for embedded devices. It is available here: https://github.com/csete/nanosdr I don't intend to create full blown PC-like desktops, instead I want to have fast, minimalistic linux images that can run a single GUI app without any display or window management. Think of it as a radio or an instrument that happens to run linux :) Alex

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rtl sdr with macbook os x v10.8.2
by paim 17 Feb '13

17 Feb '13

hello i am loking for some info before ordering the Realtek RTL2832U & Elonics E4000 is this dongle can work with macbook ?/ i am new to this group ,but new to SDR . thank you elan

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Still problem with "cb transfer status 1, cancelling" -> segmentation fault, libusb
by Markus Gonser 17 Feb '13

17 Feb '13

Hello, I am new to this mailing list, but that does not mean that I have been following SDR activities here at osmocom and especially gnuradio actively. I am not a linux professional, but "intermediate beginner". I currently have a problem running my Hama Nano DVB-T Dongle which I cannot solve and therefore need to turn to you with the following problem: I hava an Intel Pentium 977 machine running Ubuntu 12.04LTS in the 64bit version. I compiled and installed gnuradio using the script from Marcus Leech (http://www.sbrac.org/files/build-gnuradio) I have an Hama Nano DVB-T Dongle which contains an RTL2832U Chip combined with the E4000 frontend. When I try to access the Dongle via rtlsdr (either via sample programs in GRC or simply via rtl_test -s) I get cb transfer status: 1, canceling... Library error 0, exiting... Speicherzugriffsfehler (Speicherabzug geschrieben) (engl.: "segmentation fault") I found two threads regarding this problem in this mailinglist: 1) http://lists.osmocom.org/pipermail/osmocom-sdr/2013-January/000443.html 2) http://lists.gnumonks.org/pipermail/osmocom-sdr/2012-August/000201.html With respect to the former (1) I checked my version of libusb-1.0-0-dev which is 2:1.0.9~rc3-2ubuntu1 With respect to the latter (2) (and older post) I checked in my source of the rtlsdr library if the proposed change is included and it is. So I do not have any clue how and where to proceed further. I'd be happy to give you any more information you need and try out patches. If you have any ideas or could point me to the right direction, I'd be very happy about Thanks upfront for your consideration and best regards, Markus P.S.: The dongle worked on this machine before, but I do not remember if I had the 32bit Ubuntu version running and which versions of gnuradio, etc. were installed.

3 3

rtl-entropy, atmospheric radio noise entropy source
by Paul Warren 15 Feb '13

15 Feb '13

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi guys, I just finished my first go at an entropy gathering tool for rtl-sdr, it's licensed under GPL (will add LICENSE file next!) and available at: https://github.com/pwarren/rtl-entropy My aim was to have a utility that ran with a minimum of dependencies, so it could be done easily on a raspberry pi, and without trying to get a whole gnuradio stack working! I'm not a crypto expert, but I've read enough to know that you really should pass the output through rng-test or similar before using. As I mention in the Readme, I plan on doing these tests and eventually getting it to the stage where the entropy can be plumbed in to /dev/random. So, thanks for making the rtl-sdr libraries and making them easy to work with! Cheers - -- Paul Warren -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) Comment: GPGTools - http://gpgtools.org Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iEYEARECAAYFAlEeKZQACgkQkwz3ZmaDjV4e+QCeMG6rOr+PZ+yHnIeXGFJRnpsr e9oAn3vQBEW7L2mcJLJE0tyNUnZpGori =dlzx -----END PGP SIGNATURE-----

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info
by Massimo Borlis 12 Feb '13

12 Feb '13

Hi, message to the developer, you can also add this device, id: (15a4-9016-00) device: AF15BDA (v7.3.20.1) thanks waiting response. The drive is USB dikom

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Trouble using E4000 on new Dell Vostro
by Ethan Trewhitt 08 Feb '13

08 Feb '13

I have been unable to get basic tuning functionality out of my E4000 on my new laptop, in Ubuntu Precise. I'm running 64-bit Precise with the Osmocom drivers installed via the GNU Radio setup script. When I attempt to use the RTL device in Linux, the following occurs: " $ rtl_test Found 1 device(s): 0: ezcap USB 2.0 DVB-T/DAB/FM dongle Using device 0: ezcap USB 2.0 DVB-T/DAB/FM dongle Found Elonics E4000 tuner Supported gain values (14): -1.0 1.5 4.0 6.5 9.0 11.5 14.0 16.5 19.0 21.5 24.0 29.0 34.0 42.0 Reading samples in async mode... cb transfer status: 1, canceling... Library error 0, exiting... Segmentation fault (core dumped) " When I run the system in GDB and request a backtrace, this is all I get: " Program received signal SIGSEGV, Segmentation fault. 0x00007ffff6ed42e5 in ?? () from /lib/x86_64-linux-gnu/libusb-1.0.so.0 (gdb) bt #0 0x00007ffff6ed42e5 in ?? () from /lib/x86_64-linux-gnu/libusb-1.0.so.0 #1 0x00007ffff6ed447f in libusb_close () from /lib/x86_64-linux-gnu/libusb-1.0.so.0 #2 0x00007ffff7bc51a9 in rtlsdr_close () from /usr/local/lib/librtlsdr.so.0 #3 0x0000000000401322 in main () " So there is apparently some issue with libusb. This machine has four USB 3.0 ports, and I've tried using all four of them. There's no hub, but nor are there any USB 2.0 ports to try. Here's the relevant output of usb-devices: " T: Bus=03 Lev=01 Prnt=01 Port=02 Cnt=01 Dev#= 2 Spd=480 MxCh= 0 D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 P: Vendor=0bda ProdID=2838 Rev=01.00 S: Manufacturer=Realtek S: Product=RTL2838UHIDIR S: SerialNumber=00000947 C: #Ifs= 2 Cfg#= 1 Atr=80 MxPwr=500mA I: If#= 0 Alt= 0 #EPs= 1 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none) I: If#= 1 Alt= 0 #EPs= 0 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none) " Note that I have had easy success using the dongle in 64-bit Windows 7 (through the Zadig-installed drivers and SDRSharp), as well as in the same version of Ubuntu installed on another laptop (an older HP Envy). So I know the dongle works, and I know it theoretically can work with the Osmocom drivers, albeit in a different machine. Any ideas? Thanks in advance. Ethan

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Multiple dongles 1 rtl-server
by Mathison Ott 05 Feb '13

05 Feb '13

Im hopping to spark up a diolog to help to rewrite the RTL-server that the group has produced... I currently use the RTL-server with the ghpsdr-alex DSP-server. I have some code that alows the RTL-server to see multible dongles... the Problem is that unlike the Softrock-server a qtradio user cant select between the different receivers when connecting. The DSP-server needs mods to accept a tcp packet from a RTL-server with multiple RTL-dongles attached to its hardware. Keep in mind could the user select between dongles using a qt_radio check box, like the gain control. This could help to mange multiple qtradio client connections to a server. Say one receiver is indicated to be In Use, then a client can select the next one that isn't in use. I just found most of the rtl dongles to be usfull because of the vhf uhf spectrum they can receive. I have a few of the DVb units and I realized that i cant run more that one thou a DSP server at a time. Its could become useful to write DSP-server that hosts mixed devices. 73 Mathison KJ6DZB

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Re: osmocom-sdr Digest, Vol 15, Issue 3
by Jeff Murri 03 Feb '13

03 Feb '13

> -Message: 1 > Date: Sat, 2 Feb 2013 22:49:14 +0100 > From: Benedikt Heinz <zn000h(a)gmail.com> > To: osmocom-sdr(a)lists.osmocom.org > Subject: new SDR project (bladeRF) on kickstarter > Message-ID: > <CAFXU+zENpDgdfCTZu-U17GbMw-xg4BifyyPu4BwzTjK9p_mn5Q(a)mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > Hi everyone, > > just stumbled across this SDR on kickstarter: > http://www.kickstarter.com/projects/1085541682/bladerf-usb-30-software-defi… > (found via hackaday) > Maybe this is interesting for some of you. > > Cheers, > > hunz > I saw this too. It looks like a great piece of kit. Doesn't the dollars he's asking seem a bit steep though? Maybe not, and I'm hoping this comes off as a serious question. If it were opened up so that the dollars asked was lower then there'd be a lot of backers, which in turn drives build costs down further? If HackRF is half as good as I think it's going to be, then the $$ is definitely way to high. Just my (possibly uninformed) opinion. --Jeff

3 2

new SDR project (bladeRF) on kickstarter
by Benedikt Heinz 02 Feb '13

02 Feb '13

Hi everyone, just stumbled across this SDR on kickstarter: http://www.kickstarter.com/projects/1085541682/bladerf-usb-30-software-defi… (found via hackaday) Maybe this is interesting for some of you. Cheers, hunz

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